Figure 6: Plasma aldosterone measurements following the administration of placebo (control), lisinopril and Hibiscus sabdariffa on mild to medium hypertensive subjects. Each point on the graph represents the average of at least 25 independent measurements. Error bars are standard error of mean. ***P < 0.001 (placebo vs. Hibiscus sabdariffa) and ^ααP < 0.01, ^αααP < 0.001 (placebo vs. lisinopril) two-way analysis of variance with Bonferroni posttest